Ship-propeller.



No. 881,393. PATENTED MAR. 10, 1908.

0Q J. H. PLINDT.

SHIP PROPELLERg ABPLIOATION FILED JULY 25, 1906.

2% L m M CARL JULIUS HQVART FLINDT, OF COPENHAGEN, DENMARK.

sHIP-PROPELLER.

Specification of Letters Patent.

Patented March 10, 1908.

Application filedJuly 25, 1906. Serial No. 327,613.

T 0 all whom it may concern:

Be it known that I, CARL J ULIUS 'HovART FLINDT, subject of Denmark, residing at Copenhagen, in Denmark, have invented new and useful Improvements in Ship-Propellers, of which the following is a specification.

The present invention relates to propellers for ships or vessels, the particular nature of the propellers being such that the blades thereof are secured in certain positions relative to a comparatively large propeller hub such that the entire area of each of the propeller blades is utilized to the utmost possible extent in the propulsion of the ship or vessel.

A constructional form of the invention is represented in Figure 1 of the drawing, which shows a rear view of the propeller; and also in Fig. 2 showing a plan view thereof.

The hub, a, on the central shaft has a large diameter so ,that the blades will act at a suitable distance from the center of the shaft. The hub is provided with an opening, I), for the shaft, and wedges, c, are provided for engaging with corresponding recesses in the shaft and thus holding the hub and the shaft together. Each propeller blade, d, is made in one piece with a flange, 7c, by means of which, in combination with bolts or screws (not shown) the said blade,and flange are secured to the hub along the periphery thereof.

As will be apparent from the drawing and from what has been said in the foregoing statement, each blade is so shaped and so placed that every part of it acts against the water in which the ship or vessel is submerged for moving the said ship or vessel. The blade begins at one end with a narrow portion which gradually widens and at its outer end is divided into two or more parts, of which the outer part or parts gradually increase in angle with the center line of the shaft. part or parts nearest to the hub exercises a greater displacing power upon the water in contact with this portion of the blade than does the rest or outer portion thereof. The blade has the further peculiarity that Thus it is accomplished that the the beginning or narrowest portion thereof is .placed at such an angle to the axis of the shaft as to cause displacement of the water in which the propeller is submerged so that the entire blade acts to propel the ship or vessel.

In the resent instance, each blade is represente as being split at its broadest end and thus divided into two parts, I and m, the inner part m, nearest the hub, being at a smaller angle to the axis of the shaft on which the hub is mounted, than the outer part 1. Thus the nearness of the inner portion m to the hub is compensated for by the smaller angle at which it lies in relation to the shaft axis. Accordingly, the entire blade is economically shaped and adjusted so as to cause a progressive movement of the vessel without essential loss. In other words, the inner art m of the blades acts with approximate y the same power as the outer, thus compensating for the fact that it acts at a shorter distance from the hub. This is due to the fact that by reason of the smaller angle from the shaft axis, the displacement caused by the inner portion of the blades is relatively greater than that caused by the outer parts of the blades having a larger angle with the axis of the shaft.

1 claim as my invention:

A propeller, comprising a shaft, a hub thereon, and wing-shaped propeller blades, each provided with an arc shaped flange portion attached to the hub, with which flange portion the blade is in contact throughout approximately the entire length of its inner edge, the broad ends of the blades being split in the direction of their movement, and the portion between the split and the hub having an angle to the axis of the shaft comparatively smaller than the angle of the outer portion.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CARL JULIUS HOVART FLINDT.

Witnesses MARCUS MOLLER, HAROLD FRos'r. 

